FEATURE: allow for additional plugin defined global settings

app/models/global_setting.rb

@@ -1,10 +1,17 @@
 class GlobalSetting
 
+  def self.register(key, default)
+    define_singleton_method(key) do
+      provider.lookup(key, default)
+    end
+  end
+
   def self.load_defaults
     default_provider = FileProvider.from(File.expand_path('../../../config/discourse_defaults.conf', __FILE__))
-    default_provider.data.each do |name, default|
-      define_singleton_method(name) do
-        provider.lookup(name, default)
+    default_provider.keys.concat(@provider.keys).uniq.each do |key|
+      default = default_provider.lookup(key, nil)
+      define_singleton_method(key) do
+        provider.lookup(key, default)
       end
     end
   end
@@ -56,6 +63,10 @@ class GlobalSetting
       resolve(var, var.nil? ? default : "")
     end
 
+    def keys
+      @data.keys
+    end
+
 
     private
     def self.parse(file)
@@ -70,6 +81,10 @@ class GlobalSetting
       var = ENV["DISCOURSE_" << key.to_s.upcase]
       resolve(var , var.nil? ? default : nil)
     end
+
+    def keys
+      ENV.keys.select{|k| k =~ /^DISCOURSE_/}.map{|k| k[10..-1].downcase.to_sym}
+    end
   end
 
 
@@ -78,8 +93,9 @@ class GlobalSetting
   end
 
 
-  load_defaults
   @provider =
     FileProvider.from(File.expand_path('../../../config/discourse.conf', __FILE__)) ||
     EnvProvider.new
+
+  load_defaults
 end

spec/models/global_setting_spec.rb

@@ -1,6 +1,12 @@
 require 'spec_helper'
 require 'tempfile'
 
+describe GlobalSetting::EnvProvider do
+  it "can detect keys from env" do
+    ENV['DISCOURSE_BLA'] = '1'
+    GlobalSetting::EnvProvider.new.keys.should include(:bla)
+  end
+end
 describe GlobalSetting::FileProvider do
   it "can parse a simple file" do
     f = Tempfile.new('foo')
@@ -20,6 +26,9 @@ describe GlobalSetting::FileProvider do
     provider.lookup(:d,"bob").should == nil
     provider.lookup(:e,"bob").should == "bob"
 
+    provider.keys.sort.should == [:a, :b, :c, :d]
+
     f.unlink
   end
+
 end